session data in Tomcat 5

[M.Hockings]

My ISP has just upgraded the servlet container from Tomcat 4.1 (which 
was working just fine BTW) to Tomcat 5.0 (5.0.19 I believe).  I have had 
several webapps successfully deployed under Tomcat 4.1 that were causing 
Tomcat 5 not to start.  For the most part I think I have fixed all of 
these problems (largely a miss-configuration of log4j) but still one 
major problem remains. 

The remaining problem is that session data does not seem to be preserved 
from page to page.  That is, if on a simple .jsp I have something like:

  myPackage.myClass ml = new myPackage.myClass();
  session.putValue("ml",ml);
Then do a form-based submit to a second jsp which contains:
  <jsp:useBean id="ml" scope="session" type="myPackage.myClass" />
Then I get an error saying
  javax.servlet.ServletException: bean ml not found within scope
If I try to manually extract the ml attribute from the session in the 
second .jsp I find that it is not set.

I have done some Googling about this problem but I don't see anything 
that would help -- the hits were largely about clustering.  In my case I 
do not have access to the Tomcat config (server.xml) and have to live 
with how things are configured at the ISP.

Has anyone else experienced this problem?  If so, is there a solution?
To test this I have also installed Tomcat 5.0.24 on my laptop (Win2K) 
where it exhibits the same problem and on a Linux (Fedora Core 1) 
machine where it does not exhibit this problem. Both are running on 
Sun's 1.4 JDK with the stock (as shipped) server.xml.

The ISP which has been very responsive in the past is being not all that 
helpful and they had the active component of the sites down for the best 
part of a week!

Mike

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